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Finding the Fourth Proportional to 668.79, 1,002.16 and 394.58

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Solution

The fourth proportional to 668.79, 1,002.16 and 394.58 is: 591.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.79 : 1,002.16 = 394.58 : x
  2. Step 2: Convert to fraction form
    668.79/1,002.16 = 394.58/x
  3. Step 3: Cross multiply
    668.79x = 1,002.16 × 394.58
  4. Step 4: Simplify right side
    668.79x = 395,430.25
  5. Step 5: Solve for x
    x = 395,430.25/668.79
  6. Step 6: Final answer
    x = 591.26

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.